Spray gun apparatus



Feb. 27, 1945. J. A. M DONALD 2,370,408

I SPRAY GUN APPARATUS Filed Feb. 9, 1942 2 Sheets-Sheet l 1 INVENTOR:

JhMEsRfi'icDo/vHLzJ A TTORNE Y Feb. 27, 1945. J MacDONALD SPRAY GUN APPARATUS Filed Feb. 9, 1942 2 Sheets-Sheet 2 INVEN'IOR; Jane's 6. flecOomna 914% d ATTORNEY Patented Feb. 2?, 3%45 SPRAY GUN APPARATUS James A. MacDonald, Glendale, Callf., asslgnor to John U. Bil-rile, Los Angeles, Calif.

Application February 9, 1942, Serial No. 430,033

3 Claims.

This invention relates to spraying apparatus, and more particularly to apparatus of the spray gun type adapted to be held and manipulated by the hand of the operator.

An object of the present invention is to provide a hand held and manipulated apparatus embodying a plurality of spray gun for spraying convergent streams of material on a surface to be coated, in which the spray guns are adjustable to vary the angles that the convergent streams make with each other.

Another object of the invention is to provide an improved hand held and manipulated apparatus, including a plurality of guns for spraying different streams of material on a surface to be coated and to govern the operation of the spray guns from a single control point readily accessible to the operator.

A further object of the invention resides in the provision of a hand held and manipulated assembly embodying a plurality of guns for spraying different streams of material on a surface to be coated, in which operation of the spray guns is governedvby a common control actuated by the hand of the operator supporting th assembly.

Another object of the invention is to provide a plurality of spray guns adapted to be held and manipulated by the hand of the operator and to be controlled by such hand so as to selectively determine the discharge of materials from the respective guns.

The invention also contemplates a manually held and manipulated assembly embodying a gun capable of spraying one type of material, such as solid or semi-solid particles, and one or more other guns for spraying a second type of material, such as a binding agent for such particles, in which the guns are governed by a common control so as to institute operation of the solid or semi-solid particle spray gun before spraying of the binding agent from the other gun or guns.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the accompanying drawings, in which:

Fig. 1 is a top plan view of one embodiment of the invention;

Fig. 2 is a front view of the apparatus taken generally along the line 22 of Fig. 1;

Fig. 3 is a sectionalong the line 3-3 of Fig. 1;

Fig. 4 is a section taken approximately along the line 4-4 in Fig. 1.

In the general aspects of the invention, it is proposed to provide a portable multiple spray gun combination that can be held in an operators hand for movement and control by this hand. The operator can grasp one of the guns, which supports the other gun or guns.

The guns are so arranged with respect to each other as to discharge convergent streams of material that intersect to form an intimate mixture before deposition on the surface to be coated or sprayed. For the purpose of increasing the scope of operation of the portable apparatus, the guns are adjustably mounted with respect to each other to allow the angle of convergence therebetween to be altered.

In the following description, particular refer ence will be made to discharging particles from one of the guns and a latex binder from the other gun or guns capable of coating the cork particles to cause them to adhere to one another and to the surface being coated. However, it is to be understood that the specific reference to such materials throughout this description is not to be considered as limiting the invention, since it is possible to spray and admix other materials than the ones mentioned.

The particular spray gun apparatus disclosed in Figs. 1 to 4, inclusive, includes a central or primary spray gun l0 designed to discharge a stream or jet of cork particles and to be held in the hand of the operator for movement in any desired spraying direction. The body ll of this gun consists of a lower handle l2 for grasping by the operator's hand, and an intermediate portion l3 through which an air and cork particle mixture can pass.

Two liquid latex guns 22 are disclosed in the drawings, one on each side of the cork particle or flock gun Ill. The latex guns are preferably so adjusted as to have paths of discharge which intersect the path of discharge of material from the flock gun. In other words, the latex guns are angled toward each other and toward the flock gun so that the streams of material ejected from the guns intersect in advance thereof at some desired point, where they thoroughly admix before engaging the surface to be coated by the resulting mixture.

The flock or cork particle gun I0 consists of the main body ll having the depending handle it through which, as in standard practice, flows to the nozzle jets or discharge holes 49. The flow of air is valve controlled by valve means which is operable through means of a valve stem 44. The forward portion of this stem extends from the body to a point where it is engageable by a trigger 45 pivotally mounted on a bearing pin 48 fixed to the body II. By depressing the trigger 45, the valve means is opened and air is permitted to flow through the valve to the discharge holes 49.

Air borne cork particles from a suitable source enter a discharge pipe 38 through tubing 41 for ejection through the nozzle 48 at the outlet end of the gun I0. These cork particles are joined by air flowing through discharge holes 49 formed in an air cap 50 held on the body II around the nozzle 48 by a retainer nut 5I. The discharge holes 49 are so arranged as to cause air ejected therefrom not only to mix with the cork particles emanating from the nozzle 48, but also to determine the spray pattern of such particles, which preferably is a fan shape diverging outwardly in a plane substantially at right angles to the plane of the guns..

The flock gun I carries a depending support 9| to which a bracket 92 is secured by the screws 93. Latex and air headers or conduits 94, 95 are held in spaced relation in this bracket and extend transversely of the flock gun on opposite sides thereof, with the latex header 94 provided with upwardly extending nipples 94' coupled to the latex guns 22 by suitable unions 96. This union, nipple and latex header arrangement not only supports the latex gun 22 from the flock gun I0, but it also furnishes a conduit for the passage of latex through the header, nipple and union into the latex inlet 91 in the body 98 of the gun. Air is conveyed from the air header 95 through suitable tubing 99 to the air inlet I00 of each gun.

Each of the latex guns 22 is of a well known design and each includes a fluid nozzle 54 and an air cap having discharge holes as shown. The air cap 61 is held in place by a retainer nut "Ill. The spray pattern is, of course, determined by the air cap position and ispreferably of a fan shape diverging outwardly in a plane at right angles to the plane of the gun.

The latex fiow is controlled by needle valve I0 I, and the air flow is controlled by a needle valve I02. The latex needle valve I0l extends through the discharge passage I03 and packing and packing nut I04 across a space where it is fixed to a guide I05 movable within the rearward body portion of the gun. The guide bears against a coil spring I06 tending to urge the needle valve IOI to closed position. In a similar manner, an air needle valve I02 is provided in the air passage I01 of the gun, and is normally urged to closed position by a return spring I08 bearing against its guide portion I09. The needles IOI, I02 are retracted against the force of their respective springs by a secondary trigger II.0 mounted on a bearing pin III on each gun and capable of engaging the forward portions of the needle guides I05, I09 to retract them against the springs I06, I08 and remove the needles from their seats, for discharge of both air and latex in proper fashion from the guns.

All of the guns are controlled by the primary trigger 45 mounted On the flock gun I0. An operating bar H2 is secured to this trigger and extends on opposite sides of the gun for attachment to each secondary trigger IIO. This mode of attachment consists of an elongated slot II3 provided at each end of the operating bar II2 adapted to receive a pin II4 threaded or otherwise secured to the secondary trigger H0. The pin and slot arrangement is provided so as to permit angular adjustment of each latex gun 22 about the axis of the nipple 94' without interference from the operating bar 2. The pin H4 is capable of. sliding within the slot II3 whenever such adjustment is made.

When the primary trigger 45 on the flock gun is depressed to permit air to pass through it, the operating bar II2 also depresses the secondary triggers I I0, causing them to retract their associated air needle valves I02 and latex needle valves IN to allow discharge of latex from the spray guns 22. It is preferred to so arrange the control as to be capable of discharging cork particles only from the apparatus, or of discharging cork particles before latex is discharged. This purpose is accomplished by providing a certain amount of lost motion between the secondary triggers I10 and the guides I05 attached to the latex needles IOI. When the primary trigger 45 is depressed, its associated air valve 36 is immediately opened. The secondary triggers IIO also open the air needle valves I02 of the latex guns, but the liquid needles IOI are not immediately withdrawn to permit discharge of latex, since the secondary triggers IIO have not yet moved through the space initially provided between them and the guides I05 to contact the latter and retract the latex needles. Thus, discharge of cork particles from the flock gu I0 can occur before discharge of latex from the other guns 22, and if desired, a partial depression of the primary trigger 45 allows cork particles to be discharged without corresponding discharge of latex.

The latex guns 22 are adjustable about the respective axes of their nipples 94 to vary the angles that they make with each other and with the cork gun I0. A plate H5 is mounted on a pivot pin II6 secured to the rearward portion of the body 98 of each latex gun and has one member of a hinge II'I secured thereto, the other member being fastened to an adjusting bar IIB having a slot II9 adapted to receive a clamp screw I20 threaded into the body II of the cork gun. It is to be noted that the plates I I5, hinges Ill and adjusting bars II8 extend toward each other so as to be clamped in any position of adjustment by the single screw I20.

If the angle of one of the guns 22 is to be altered, its associated unian 96 is loosened, as well as the clamp screw I20. The gun is then turned on its nipple 94 to the desired angle and the union 96 tightened. Such turning also affects a shifting of the plate I I5 and its adjusting bar I I8. The plate pivots on its pin H6, and after the necessary adjustment has been made, it is held in its new position with respect to the gun by a clamp screw I2I extending through an arcuate slot I22 in the plate and into the body 98 of the latex gun. The adjusting bars II8 are also held in their new and altered position by tightening the clamp screw I20.

It is therefore apparent that a spray gun apparatus has been provided in which the relative angles of discharge of the guns are variable, and in which all of the guns are operable from a single source of control. The entire apparatus can be held in the hand of the operator, who also has full finger control over the operation of the apparatus to selectively determine if cork particles only are to be sprayed on the surface to be coated, or both cork particles and latex. Such control of the various guns is accomplished in a without danger of entanglement in these lines or tubing.

While preferred embodiments of the invention have been disclosed herein, it is to be understood that various changes may be made in its construction by those skilled in the art without departing from the spirit of the invention as defined in the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. An apparatus of the character described, including a primary spray gun having a hand hold portion and an adjacent primary trigger for controlling discharge of material from said gun, a secondary spray gun carried by said primary gun and having a secondary trigger for controlling discharge from said secondary gun, and means interconnecting said triggers for movement together.

2. An apparatus of the character described, including a primary spray gun having a hand hold portion and an adjacent primary trigger for controlling discharge of material from said gun, a secondary spray gun carried by said primary gun andhaving a retractable valve for controlling discharge from said secondary gun, a trigger mounted on said secondary gun for cooperation with said valve to retract the same, and means interconnecting said triggers for movement together.

3. An apparatus of the character described, including a primary spray gun having a hand hold portion and an adjacent primary trigger for controlling discharge of material from said gun, a secondary spray gun carried by said primary gun, means for mounting the secondary spray gun on said primary gun for adjustment with respect thereto to enable the angle of discharge of said secondary gun to be varied relative to said primary gun, a secondary trigger for controlling discharge of material from said secondary gun, and means interconnecting said triggers for movement together, said means being adjustable to compensate for adjustment in the position of said secondary gun with respect to said primary gun.

JAMES A. MACDONALD. 

